51149380 has 24 divisors (see below), whose sum is σ = 110880000. Its totient is φ = 19799520.

The previous prime is 51149339. The next prime is 51149383. The reversal of 51149380 is 8394115.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (51149383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40630 + ... + 41869.

It is an arithmetic number, because the mean of its divisors is an integer number (4620000).

Almost surely, 2^51149380 is an apocalyptic number.

It is an amenable number.

51149380 is an abundant number, since it is smaller than the sum of its proper divisors (59730620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51149380 is a wasteful number, since it uses less digits than its factorization.

51149380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82539 (or 82537 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51149380 is about 7151.8794732574. The cubic root of 51149380 is about 371.2046927822.

It can be divided in two parts, 51149 and 380, that added together give a square (51529 = 227²).

The spelling of 51149380 in words is "fifty-one million, one hundred forty-nine thousand, three hundred eighty".